Contact-filing device



Jan. 19 1926. J. H. SIMPSON cou'mcw FILING DEVICE Filed July 26, 1922 76 .6 /6 i v ,Zizvenii'r 'Jaz -msvm am 4 a- 1 I I 7 Patented Jan. 19,1926.

. UNITED] STATES 1,510,090 PATENT, OFFICE.

JOHN 1;. Simpson, or rnovnmncn, nnona'rstmn.

CONTACT-FILING DEVICE.

Application filed 11113726, 1922. Serial No. 577,687.

T 0 all whom it may concern:

Be it known that I, JOHN H. SIMPSON, a citizen of the United States,residing at Providence, in the county of Providence and State of RhodeIsland, have invented certain new and useful Improvements inContact-Filing Devices, of which the following is a specification.

My invention relates to an apparatus for filing the contact points ofspark coils.

Oneobject of my invention is to provide means to so position and holdthe contact points of a spark coil vibrator that their coacting surfacesmay be filed during one operation.

Another object of my invention is the provision of means for filing thecontact points of a spark coil vibrator in a manner to insure that theirrespective coacting surfaces will be parallel to each other.

In the accompanying drawings which 11- lustrates my invention Fig. 1 isa side elevation of an ordinary spark coil showing my invention appliedthereto, parts being shown in section.

Fig. 2 is a perspective view of the contact filing member,

Fig. 3 is an enlarged detail section of the contact filing member inoperating position on the coil, and

Fig. at is a section taken on line 44 of Fig. 3.

Referring to Fig. 1, I have shown a spark coil 1 of conventional typeprovided with the usual terminals 2, 3, and 4., a vibrator spring 5carrying a contact point 6, cooperating with the contact point 7 carr edby the arm 8 and the post 9 and ad ust1ng nut 10 threaded thereon. Thegeneral con-,

struction of a spark coil being well understood a further descriptionwill not be necessary.

After a spark coil has been in use for any length of time it frequentlybecomes necessary to clean the contact points, which is bestaccomplished by filing their coacting surfaces. However, as the bestresults are obtained from the coil when the coacting surfaces of thecontact points are flat and parallel to each other, it will be seen thatthe filing of said surfaces must be rather carefully done.

In order to facilitate the filing operation above mentioned I haveprovided a contact filing device comprising a substantially fiat plate12. The plate 12 in this illustration being in the form of a disk havingin its upper surface a countersunk ortion; 14, corresponding in shape tothe ree end of the vibrator spring 5 and adapted to receive said freeend as shown. The countersunk portion 14 is provided with the open endedslot 15 to accommodate the post 9 when the device is in position asshown in Figs. 1 and 3. The plate 12 is also provided with guideways 16struck upwardly from its upper surface, while diametrically opposite theopen end of the slot 15 is the downwardly and inwardly bent extension17, forming a spring adapted to rest on the top of the coil casing andassist in ositionin the entire filing device. The f fee end 0 theextension 17 is cut away as at 17 to afford clearance for the post 9.

For operation in the guideways 16 I provide a narrow blade-like file 18roughened on both faces but at its center portion only as at 18 andhaving one end rolled to form a head 19 while the opposite end 20 isflat to permit insertion in the guideways 16.

To place my contact filing device in operative position the file 18 isfirst removed from the guideways 16 and the plate 12 is then insertedunder the vibrator spring 5 of the coil, the post 9 passing into theslot 15 and the free end of the vibrator spring 5 being received by thecountersunk portion 14 of the plate 12 as shown. The file 18 is nowinserted in one of the guideways 16 and the nut 10 of the post 9 beingin a raised position the file 18 is passed between the contact points 6and 7 and its flat end 20 is inserted in the opposite guideway 16 asshown in Fig. 4 of the drawings. The nut 10 is now adjusted downwardlyon the post 9 and cooperates with the spring extension 17 of the plate12 to position and maintain the contact points 6 and 7 in frictionalengagement with the upper and lower faces respectively of the file 18.The device is now ready for operation and to file the contact points itis only necessary to grasp the flat end 20 of the file 18 andreciprocate the fi le 18 in the guideways 16 when the central portion 18will operate to cut away from the contact points any pits or foreignsubstance which may be present.

Remove the file 18 and withdraw plate 1 from under the vibrator spring5. Test out the spark on any suitable coil testing device. If itisimpossible to produce a spark of the desired nature, the filing devicemay be replaced for further use, the contact points automatically takingup the same relative position assumed during the adjusting of saiddevice.

Having thus described the construction and operation of my inventionwhat I claim 1. A contact filing device comprising a substantially'flat'metallic member adapted to-position and retain one contact pointin fixed relative position with relation to another" contact point of aspark coil, in combination witha file member adapted to cooperatetherewith and simultaneously file the coacting surfaces of said contactpoints while in said relative position.

2. In a contact filing device, a substantially fiat plate member havinga slot, indented portions adapted to receive the vibrator of a sparkcoil, guideways on its up per surface, a resilient bent under portionadapted to cooperate with the vibrator adjusting nut and a file memberi-nsertable in said guideways and reciprocal therein.

In testimony whereof, I afiix mysignature.

JOHN H. SIMPSON.

